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I want to put a 4 man Hot Tub on a upper wooden deck about 8' off the ground. Will it safely hold the weight?
The deck 13’ wide and 14’ long and is constructed with pressure treated wood; 2X6 joists 16" on centre. Bolted to side of house + 2 6x6 cross beams supported by attaching to house and 4X4 posts. The decking is 1/2" PT material. The deck is about 10 years old and I was not around when it was built. The 4 man hot tub is second hand with no manual. I have no idea of how much the tub weighs. Living in Ontario snow load is also a factor. If the deck is not safe as is - what do I have to do to make it safe?
There may be some here who would tell you, go ahead, but I can't. I have a six man spa on 2x10 floor joists with very short spans and a 2x10, three-dimension cross brace directly underneath it. That might be extreme, but since it is an indoor spa, redoing it (if it fails) would be amazingly difficult and expensive.
A key consideration is the age of the deck and the fact you can't be sure how well those bolts were attached to the house. If the deck collapses. you've got to wrestle with the hot tub and the structure.
The deck substructure which meets requirements for a deck with a normal load won't last forever anyway. Why not build a deck that you know will be build right? I assume the posts are one four-foot (or whatever the code requires in Ontario) footings. But you have no easy way of determining that for yourself.
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